naysilva on "WordPress - Setting a default 'featured image' for each Catergory"

Hi there,

I want to set a default 'Featured Image' for every category that I have.

In my functions.php file I have the following code:-

/* ---------------FEATURED POST IMAGE------------------------*/
    function default_category_featured_image() {
    global $post;
    $featured_image_exists = has_post_thumbnail($post->ID);
    if (!$featured_image_exists) {
    $attached_image = get_children( "post_parent=$post->ID&post_type=attachment&post_mime_type=image&numberposts=1" );

    if ($attached_image) {
    foreach ($attached_image as $attachment_id => $attachment) {
    set_post_thumbnail($post->ID, $attachment);
    }}
    else if ( in_category('2') ) {
    set_post_thumbnail($post->ID, '112');
    }
    else if ( in_category('3') ) {
    set_post_thumbnail($post->ID, '115');
    }
    else if ( in_category('4') ) {
    set_post_thumbnail($post->ID, '113');
    }
    else if ( in_category('8') ) {
    set_post_thumbnail($post->ID, '114');
    }
    else {
    set_post_thumbnail($post->ID, '0');
    }
    }
    }
    add_action('the_post', 'default_category_featured_image');

Which is working for most of the Categories apart from WordPress. There are 6 posts at the minute that have 'WordPress' as the category and they all are using category ID '3', but for some unknown reason, a few of the posts that have 'WordPress' as the category have the default featured image set, where as a few don't have any default image set?

Any idea why this is happening:-

You can see the problem here:-

http://www.web-tricks.co.uk

From the homepage you can see the title 'How to increase WordPress Memory Limit' is working, and 'Web-Tricks Top 10 Best Plugins for WordPress' is now, but they have the same category ID - Any ideas?